DS3696N [NSC]
Multipoint RS485/RS422 Transceivers/Repeaters; 多点RS485 / RS422收发器/转发器
| 型号： | DS3696N |
| 厂家： | 
National Semiconductor |
| 描述： | Multipoint RS485/RS422 Transceivers/Repeaters |
| 文件： | 总12页 (文件大小：313K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 1998
DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
Features
n Meets EIA standard RS485 for multipoint bus
The DS3695, DS3696, and DS3697 are high speed differen-
tial TRI-STATE® bus/line transceivers/repeaters designed to
meet the requirements of EIA standard RS485 with extended
common mode range (+12V to −7V), for multipoint data
transmission.
transmission and is compatible with RS-422
n 15 ns driver propagation delays with 2 ns skew (typical)
n Single +5V supply
±
n −7V to +12V bus common mode range permits 7V
The driver and receiver outputs feature TRI-STATE capabil-
ity. The driver outputs remain in TRI-STATE over the entire
common mode range of +12V to −7V. Bus faults that cause
excessive power dissipation within the device trigger a ther-
mal shutdown circuit, which forces the driver outputs into the
high impedance state. The DS3696 provides an output pin
TS (thermal shutdown) which reports the occurrence of the
thermal shutdown of the device. This is an “open collector”
pin with an internal 10 kΩ pull-up resistor. This allows the line
fault outputs of several devices to be wire OR-ed.
ground difference between devices on the bus
n Thermal shutdown protection
n High impedance to bus with driver in TRI-STATE or with
power off, over the entire common mode range allows
the unused devices on the bus to be powered down
n Combined impedance of a driver output and receiver
input is less than one RS485 unit load, allowing up to 32
transceivers on the bus
n 70 mV typical receiver hysteresis
Both AC and DC specifications are guaranteed over the 0˚C
to 70˚C temperature and 4.75V to 5.25V supply voltage
range.
Connection and Logic Diagrams
DS010408-1
DS010408-12
Top View
Top View
DS010408-13
Top View
Order Number DS3695N, DS3695TN,
DS3696N, or DS3697N
See NS Package Number N08E
Note 1: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS010408
www.national.com
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
−65˚C to
+150˚C
Lead Temperature (Soldering, 4
sec.)
260˚C
Supply Voltage, VCC
Control Input Voltages
Driver Input Voltage
Driver Output Voltages
Receiver Input Voltages
(DS3695, DS3696)
7V
7V
Recommended Operating
Conditions
7V
Min
Max
Units
+15V/−10V
Supply Voltage, VCC
Bus Voltage
4.75
−7
5.25
+12
V
V
+15V/−10V
Operating Free Air Temp. (TA)
Commercial
Receiver Common Mode Voltage
(DS3697)
0
+70
+85
˚C
˚C
±
5.5V
25V
Industrial
−40
Receiver Output Voltage
@
Continuous Power Dissipation 25˚C
N Package
1.07W (Note
4)
Electrical Characteristics (Notes 3, 4)
<
<
0˚C ≤ TA ≤ +70˚C, 4.75V VCC 5.25V unless otherwise specified
Symbol
Parameter
Differential Driver Output
Voltage (Unloaded)
Conditions
Min
Typ
Max Units
=
VOD1
IO
0
5
V
=
=
VOD2
Differential Driver Output
(Figure 1 )
R
6)
50Ω; (RS-422) (Note
27Ω; (RS-485)
2
V
V
Voltage (with Load)
R
1.5
∆VOD
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
Driver Common Mode Output Voltage
Change in Magnitude of Driver
Common Mode Output Voltage
for Complementary Output States
Input High Voltage
0.2
3.0
0.2
V
V
V
=
VOC
(Figure 1 )
R
27Ω
∆|VOC
|
VIH
VIL
VCL
IIL
2
V
V
Input Low Voltage
DI, DE,
RE , E, RE /DE
0.8
−1.5
−200
20
=
Input Clamp Voltage
Input Low Current
Input High Current
Input Current
IIN −18 mA
V
=
VIL 0.4V
µA
µA
mA
=
VIH 2.4V
IIH
=
=
IIN
DO/RI, DO /RI
VCC 0V or
VIN 12V
+1.0
5.25V
=
=
RE /DE or DE
0V
=
VIN −7V
−0.8
mA
µA
RI, RI
=
±
100
IOZD
TRI-STATE Current
DS3697 & DS3698
DO, DO
VCC 0V or 5.25V, E 0V
<
<
−7V VO +12V
VTH
Differential Input Threshold
Voltage for Receiver
−7V ≤ VCM ≤ +12V
−0.2
2.4
+0.2
V
=
∆VTH
VOH
VOL
Receiver Input Hysteresis
Receiver Output High Voltage
VCM 0V
70
mV
V
=
IOH −400 µA
=
Output Low Voltage
RO
TS
IOL 16 mA (Note 6)
0.5
V
=
IOL 8 mA
0.45
V
=
±
IOZR
OFF-State (High Impedance)
Output Current at Receiver
Receiver Input Resistance
VCC Max
20
µA
0.4V ≤ VO ≤ 2.4V
−7V ≤ VCM ≤ +12V
RIN
12
kΩ
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2
Electrical Characteristics (Notes 3, 4) (Continued)
<
<
0˚C ≤ TA ≤ +70˚C, 4.75V VCC 5.25V unless otherwise specified
Symbol
Parameter
Supply Current
Conditions
Min
Typ
42
Max Units
ICC
No Load
(Note 6)
Driver Outputs Enabled
Driver Outputs Disabled
60
40
mA
mA
mA
mA
mA
27
=
IOSD
Driver Short-Circuit Output Current
Receiver Short-Circuit Output Current
VO −7V (Note 6)
−250
+250
−85
=
VO +12V (Note 6)
=
IOSR
VO 0V
−15
Note 2: “Absolute Maximum Ratings” are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should
be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.
Note 3: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified.
=
=
25˚C.
Note 4: All typicals are given for V
CC
5V and T
A
Note 5: Derate linearly at 11.1 mW/˚C to 570 mW at 70˚C.
Note 6: All limits for which Note 5 is applied must be derated by 10% for DS3695T and DS3696T. Other parameters remain the same for this extended temperature
range device (−40˚C ≤ T ≤ +85˚C).
A
<
<
Switching Characteristics (Notes 4, 7) 0˚C ≤ TA ≤ +70˚C, 4.75V VCC 5.25V unless otherwise specified
Receiver Switching Characteristics
(Figures 2, 3, 4)
Symbol
Conditions
Min
15
15
0
Typ
25
Max
37
Units
ns
=
tPLH
tPHL
|tPLH–tPHL
tPLZ
CL 15 pF
S1 and S2
Closed
25
37
ns
|
ns
=
CL 15 pF, S2 Open
5
12
12
15
15
16
16
20
20
ns
=
tPHZ
CL 15 pF, S1 Open
5
ns
=
tPZL
CL 15 pF, S2 Open
7
ns
=
tPZH
CL 15 pF, S1 Open
7
ns
Driver Switching Characteristics
Symbol
Conditions
Min
Typ
Max
Units
SINGLE ENDED CHARACTERISTICS (Figures 5, 6, 7)
=
tPLH
tPHL
SKEW|tPLH–tPHL
RLDIFF 60Ω
9
9
15
15
2
22
22
8
ns
ns
ns
ns
ns
ns
ns
=
=
CL1 CL2 100 pF
t
|
=
tPLZ
tPHZ
tPZL
tPZH
CL 15 pF, S2 Open
7
7
15
15
35
35
30
30
50
50
=
CL 15 pF, S1 Open
=
CL 100 pF, S2 Open
30
30
=
CL 100 pF, S1 Open
DIFFERENTIAL CHARACTERISTICS (Figures 5, 8)
=
tr, tf
RLDIFF 60Ω
6
10
18
ns
=
=
CL1 CL2 100 pF
Note 7: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3697 only.
3
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AC Test Circuits and Switching Waveforms
DS010408-15
FIGURE 1. Driver VOD and VOC
DS010408-3
FIGURE 2. Receiver Propagation Delay Test Circuit
DS010408-4
Note: Differential input voltage may be realized by grounding RI and pulsing RI between +2.5V and −2.5V.
FIGURE 3. Receiver Input-to-Output Propagation Delay Timing
DS010408-5
FIGURE 4. Receiver Enable/Disable Propagation Delay Timing
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4
AC Test Circuits and Switching Waveforms (Continued)
DS010408-7
DS010408-6
Note: Unless otherwise specified the switches are closed.
FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits
DS010408-8
Note: t
PLH
and t
PHL
are measured to the respective 50% points. t is the difference between propagation delays of the complementary outputs.
SKEW
FIGURE 6. Driver Input-to-Output Propagation Delay Timing (Single-Ended)
DS010408-9
FIGURE 7. Driver Enable/Disable Propagation Delay Timing
DS010408-10
FIGURE 8. Driver Differential Transition Timing
5
www.national.com
Function Tables
DS3695/DS3696 Transmitting
Inputs
Thermal
Outputs
*
TS
RE
DE
DI
Shutdown
DO
DO
(DS3696 Only)
X
X
X
X
1
1
0
1
1
0
OFF
OFF
OFF
ON
0
1
Z
Z
1
0
Z
Z
H
H
H
L
X
X
DS3695/DS3696 Receiving
Inputs
Outputs
*
TS
RE
DE
RI–RI
RO
(DS3696 Only)
0
0
1
0
0
0
≥ +0.2V
≤ −0.2V
X
1
0
Z
H
H
H
DS3697
Inputs
RI-RI
Thermal
Outputs
E
Shutdown
DO
DO
RO
(DS3697 Only)
1
1
0
1
1
≥ +0.2V
≤ −0.2V
X
OFF
OFF
OFF
ON
0
1
Z
Z
Z
1
0
Z
Z
Z
1
0
Z
1
0
≥ +0.2V
≤ −0.2V
ON
X — Don’t care condition
Z — High impedance state
*
TS is an “open collector” output with an on-chip 10 kΩ pull-up resistor that reports the occurrence of a thermal shutdown of the device.
Typical Application
DS010408-11
Note: Repeater control logic not shown, see AN-702.
www.national.com
6
Typical Performance Characteristics
Driver VOH vs
IOH vs Temperature
Driver VOH vs IOH vs VCCDriver
VOH vs IOH vs VCC
Driver VOL vs
IOL vs Temperature
DS010408-19
DS010408-20
DS010408-21
Driver Differential
Propagation
Delay vs Temperature
Driver Differential Propagation
Delay vs VCC
Driver VOH vs IOH vs VCC
DS010408-22
DS010408-23
DS010408-24
Driver Single-Ended Propagation
Delay vs Temperature
Driver Single-Ended Propagation
Delay vs VCC
Driver Transition Time
vs Temperature
DS010408-25
DS010408-26
DS010408-27
7
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Typical Performance Characteristics (Continued)
Driver Transition Time
vs VCC
Cable Length vs Data Rate
DS010408-29
DS010408-28
Supply Current vs
Temperature
Supply Current vs Power
Supply Voltage
Driver ICC vs Switching
Frequency
DS010408-32
DS010408-30
DS010408-31
Driver Short
Circuit Current
vs Temperature
Receiver VOH vs IOH
vs Temperature
Receiver VOH vs
IOH vs VCC
DS010408-34
DS010408-35
DS010408-33
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8
Typical Performance Characteristics (Continued)
Receiver Differential
Propagation Delay
vs Temperature
Receiver VOL vs IOL
Receiver VOL vs
vs Temperature
IOL vs VCC
DS010408-36
DS010408-37
DS010408-38
Receiver Differential
Propagation Delay
vs VCC
Receiver Short
Circuit Current
vs Temperature
Receiver Short
Circuit Current
vs Power Supply
DS010408-40
DS010408-41
DS010408-39
Receiver Non-Inverting
Input Current
vs Temperature
Receiver Non-Inverting
Input Current vs
Power Supply Voltage
Receiver Inverting
Input Current
vs Temperature
DS010408-42
DS010408-43
DS010408-44
9
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Typical Performance Characteristics (Continued)
Receiver Inverting
Input Current vs
Power Supply Voltage
Hysteresis and Differential
Transition Voltage
vs Temperature
Hysteresis and
Differential Transition
Voltage vs VCC
DS010408-45
DS010408-46
DS010408-47
www.national.com
10
11
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead Molded Dual-In-Line Package (N)
Order Number DS3695N, DS3696N, DS3697N, or DS3695TN
NS Package Number N08E
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